Match by Multiple Possible Conditions ($or) The following query filter uses the$oroperator to find documents whereversionis4, ornameisAndrea Le: { $or: [ { version: 4 }, { name: "Andrea Le" } ] } The query retu
ANY operator with multiple conditions queries,flutter,dart 760September 22, 2024 Migrate list of embedded objects java,kotlin 038September 16, 2024 Running the custom user creation function throws $undefined: true in console flutter 21182September 14, 2024 ...
The abovefind()query of MongoDB is applied on the collection student where it takes the$whereoperator as a parameter. Then, a JavaScript function is set in the where parameter to filter the documents. The function is specified to check whether theagefield of the current document is greater t...
Specify Multiple Conditions for Array Elements Query an Array with Compound Filter Conditions on the Array Elements 查询数组字段dim_cn中一个元素的值大于15且另一个元素的值小于20,或者单个元素满足两个条件的所有文档: db.inventory.find( { dim_cm: { $gt: 15, $lt: 20 } } ) { "item" : "jo...
db.collectionName.find({$and:[{fieldName1:'value1'},{fieldName2:'value2'}]}) In this query, documents will be returned only if they meet both conditions:fieldName1must equalvalue1, andfieldName2must equalvalue2. Output: {"_id": ObjectId("..."),"fieldName1": "value1","fieldNam...
Don't forget to adjust the index definition when using your custom query condition.Best PracticeMake your jobs idempotent and transactional. Idempotency means that your job can safely execute multiple times. Run this package in cluster mode. Design your jobs in a way that you can run lots of ...
db.data.find( { a: 5, b: { $lt: 3} } ).sort( { b: 1 } ) { a: 1, b: 1 } As the last operation shows, only the index fieldsprecedingthe sort subset must have the equality conditions in the query document; the other index fields may specify other conditions. ...
We can query the view to find out the total amount sold of each product. db.sales.aggregate( [ { $group: { _id: "$prodId", amountSold: { $sum: { $multiply: [ "$price", "$numPurchased" ] } } } } ] ) Output: [
find({"age" : 27}) If we have a string we want to match, such as a "username" key with the value "joe", we use that key/value pair instead: > db.users.find({"username" : "joe"}) Multiple conditions can be strung together by adding more key/value pairs to the query document...
set of conditions. A subtle limitation in MongoDB is that the conditions used in the find command must be a constant value specified in the query itself. This means that you cannot write a query in MongoDB that finds documents in which a certain value matches another value from the ...